And, what are the downsides to it?

 

well the JDM S2K has compression ratio 11.7 and puts out 250ps.. maybe 8 or so more whp? If thats the main difference, then I would assume 11.5 would be good for 4-5whp? shot in the dark.

 

You will end up with a lifetime of adding octane boost to your fuel.

 

So everytime one was to fill up his tank with 93 octane fuel, he/she would have to add a bottle of octane booster?

 

Probably more. 11.7 to 1 compression requires some serious octane.

 

[QUOTE=Sideways,Jan 24 2007, 11:26 AM] Probably more.

 

So does it move it up to 11.5 or 11.7? Adding octane booster would be a PITA.

 

What other brand headgaskets are out to raise the compression but keep stock design?

Cometic?
Mugen?
J's?

Thanks,

Andrew

 

Yes please sideways, if you could explain a little more.

The spoon headgasket is .45mm thinnner than the stock HG.

I was under the impression that the Jap spec S had the higher compression of 11.7 : 1. And at the same time they do not run any extrodinary octane. Also I heard that you do not need to worry about really high compression ratios until you hit the 12-12.5 : 1 area. I have also seen many, non-F series honda engines, running in that area on 93 octane with no ill effects.

I for one am running a higher compression ratio after my engine rebuild. My head and block were decked and then I also went and put on the Spoon headgasket. So I calculated a while ago I was running ~11.85 : 1. I have been going for 15k miles with no problems.

Allthough I have no dyno results my builder and i both noted the much stronger feeling in the low and mid rpm area. I have used a scantool type device and found I am running the same timing as multiple other S's and my previous engine.

I run 93 octane here in Florida.

 

93 octane fuel is good to 12:1 compression before any timing needs to be pulled. To get the best gains from upping the compression, a programmable ecu would be needed to fine tune the fuel and timing maps, to be sure to avoid any possible detonation. Octane additives will not be necessary, unless you have coolant problems. I would strongly suggest doing the necessary coolant mods (tstat, fan switch), before doing the head gasket, as pre-detonation is a product of both temperature and pressure. Take the temp down, you can up the pressure, and make more power.